I have a friend who is getting rid of his GT 240 for a new card and said he'd sell it to me for $20. I have an HD 7850 running on a pice 2.0 x16 slot, but I also have a second slot which would cause them both to run at x8.

Physx is something I've never really cared about, but I was hoping if I ran a Hybrid Physx setup it would improve my performance in Planetside 2 by off loading the game physics onto the GT 240.

My questions are, i) would/could it theoretically imrpove performance in Planetside 2? ii) would running at x8 be a detriment to the primary card (my 7850)?

It would only offload specific effects calculations which don't happen on your AMD card right now. It would also only benefit you with games that actually have Physx as an option (like PS2) I found this thread which has some comparisons showing huge performance gains when the Physx card is added in.

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